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Laser Raman detection method for quantitative analysis of CO2 gas carbon isotope composition

A quantitative analysis and carbon isotope technology, applied in the field of spectral analysis, can solve the problem of not being able to obtain the carbon isotope of a single fluid inclusion, and achieve the effect of wide application prospects

Inactive Publication Date: 2016-04-13
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, what is obtained by this method is the CO of minerals in different periods and different origins 2 As a result of carbon isotope mixing, a single fluid inclusion CO in a mineral representing a specific diagenetic ore-forming stage cannot be obtained. 2 Carbon Isotopic Composition

Method used

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  • Laser Raman detection method for quantitative analysis of CO2 gas carbon isotope composition
  • Laser Raman detection method for quantitative analysis of CO2 gas carbon isotope composition
  • Laser Raman detection method for quantitative analysis of CO2 gas carbon isotope composition

Examples

Experimental program
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Effect test

Embodiment 1

[0053] prepared in the laboratory 12 CO 2 / 13 CO 2 Hybrid CO 2 Man-made inclusions, known CO 2 in artificial inclusions 12 CO 2 and 13 CO 2The molar ratio of C [12CO2] / C [13CO2] =1, then according to formula C [12CO2] / C [13CO2] =(A 12CO2 / A 13CO2 )×(F 13CO2 / F 12CO2 ), estimating the man-made inclusions 12 CO 2 and 13 CO 2 The molar ratio of , and compare the relative error. at a molar ratio of 1 12 CO 2 / 13 CO 2 In the Raman spectrum of artificial inclusions, it can be clearly seen that the peak position is at 1267cm -1 (ν - [13CO2] ),1372cm -1 (ν + [13CO2] ),1287cm -1 (ν - [12CO2] ) and 1390cm -1 (ν + [12CO2] ), they are 12 CO 2 and 13 CO 2 The Raman characteristic peak, the peak area of ​​the characteristic peak is A - [13CO2] 、A + [13CO2] 、A - [12CO2] 、A + [12CO2] , the sum of peak areas A - [12CO2] +A + [12CO2] with A - [13CO2] +A + [13CO2] denoted as A 12CO2 、A 13CO2 . Table 3 lists the man-made inclusions in ...

Embodiment 2

[0057] prepared in the laboratory 12 CO 2 / 13 CO 2 Hybrid CO 2 Man-made inclusions, known 12 CO 2 and 13 CO 2 The molar ratio of C [12CO2] / C [13CO2] =2, then according to formula C [12CO2] / C [13CO2] =(A 12CO2 / A 13CO2 )×(F 13CO2 / F 12CO2 ), estimating the man-made inclusions 12 CO 2 and 13 CO 2 The molar ratio of , and compare the relative error. at a molar ratio of 2 12 CO 2 / 13 CO 2 In the Raman spectrum of artificial inclusions, it can be clearly seen that the peak position is at 1267cm -1 (ν - [13CO2] ),1372cm -1 (ν + [13CO2] ),1287cm -1 (ν - [12CO2] ) and 1390cm -1 (ν + [12CO2] ), they are 12 CO 2 and 13 CO 2 The Raman characteristic peak, record the peak area of ​​the characteristic peak as A - [13CO2] 、A + [13CO2] 、A - [12CO2] 、A + [12CO2] , the sum of peak areas A - [12CO2] +A + [12CO2] with A - [13CO2] +A + [13CO2] denoted as A 12CO2 、A 13CO2 . Table 4 lists the man-made inclusions in 12 C and 13 The peak ...

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Abstract

The invention provides a laser Raman detection method for quantitative analysis of a CO2 gas carbon isotope composition, comprising the following steps: 1, calculating Raman quantification factor F12CO2 of 12CO2; 2, calculating Raman quantification factor F13CO2 of 13CO2; 3, calculating the mole ratio C[12CO2] / C[13CO2] of 12CO2 and 13CO2 in CO2 gas according to the formulation of C[12CO2] / C[13CO2]=(Al2CO2 / Al3CO2)*(F13CO2 / F12CO2). The detection method disclosed by the invention is used for microscopic laser Raman test analysis on 12CO2 / N2 mixed gas and 13CO2 / N2 mixed gas in different proportions, the adopted microscopic laser Raman spectroscopy has the characteristics of high precision, in-situ detection, no loss, rapidness and the like, and the CO2 gas carbon isotope composition can be quantitatively analyzed by utilizing the microscopic laser Raman spectroscopy. The laser Raman detection method disclosed by the invention has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of spectral analysis, in particular to a method for quantitative analysis of CO 2 Laser Raman detection method of gas carbon isotope composition. Background technique [0002] Raman spectroscopy is an important modern molecular spectroscopy technology, which has been widely used in physics, chemistry, materials, petroleum, biology, environment, geology, astronomy and other fields. Microlaser Raman spectroscopy (LRM) is to focus the incident laser light on the sample through a microscope, and accurately obtain the relevant chemical composition, crystal structure, molecular interaction and molecular orientation of the illuminated sample micro-region without interference from surrounding substances. and other information. Laser Raman spectroscopy has gradually become an important analysis method in the basic research of earth science. [0003] Fluid inclusions are the original geological fluids in which mine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/65
Inventor 李荣西李佳佳董会王志海赵帮胜王宁程敬华覃小丽李得路吴小力王永炜
Owner CHANGAN UNIV
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